IS357A

Overview

The IS357A is a high-density mounting phototransistor optically coupled isolator manufactured by Isocom Components. It integrates an infrared light-emitting diode with an NPN silicon photodarlington output in a compact dual in-line plastic package. The device provides electrical isolation between input and output circuits, ensuring signal integrity in noisy environments. Key specifications include a minimum current transfer ratio of 600% and robust isolation capabilities rated at 3.75 kV RMS and 5.3 kV peak. All electrical parameters are subjected to 100% testing during production to guarantee reliability and performance consistency across applications.

Feature Summary

• High density mounting design for space-efficient circuit layouts
• Optical coupling between infrared LED and NPN silicon photodarlington
• Marked as FPD1 for identification and traceability
• 100% tested electrical parameters for guaranteed performance

Applications

• Computer terminals
• Industrial systems controllers
• Measuring instruments
• Signal transmission between systems of different potentials and impedances

Procurement Notes

Verify the component marking matches FPD1 to confirm authenticity. Ensure the procurement source provides documentation confirming the 100% electrical parameter testing mentioned in the datasheet. Check for compliance with relevant industry standards if required for specific industrial or measuring instrument applications. Confirm package type compatibility with existing PCB footprints before ordering.

Selection Notes

Select the IS357A when high current transfer ratio and compact form factor are required for optical isolation. It serves as a drop-in replacement for Sharp PC355, facilitating easier upgrades or replacements in existing designs. Consider its suitability for applications involving signal transmission between disparate potential levels. Evaluate the need for high-density mounting solutions in constrained board spaces.

Part Context

Isocom Components specializes in optocoupler isolators and switch chips, leveraging over four decades of experience in the field. The company focuses on providing industry-standard alternatives and customizing electrical parameters for specific circuit needs. The IS357A belongs to their range of high-density mounting phototransistor optically coupled isolators, designed for reliable performance in various electronic systems.

Replacement Considerations

The IS357A is documented as a drop-in replacement for the Sharp PC355. When substituting, verify that the pinout and mechanical dimensions of the Sharp PC355 match the IS357A's dual in-line plastic package. Ensure the replacement meets the same isolation voltage and current transfer ratio requirements for the specific application.